The Complete Guide to 1974 Duster Suspension Parts

If you're restoring a 1974 Plymouth Duster or just need to refresh the suspension, choosing the right parts is critical to handling, ride quality, and safety. The Duster’s front suspension uses a torsion bar system, while the rear has leaf springs. Many parts interchange with other Chrysler A-body cars from the era, but there are specific details for the ’74 model year. This guide covers the essential suspension components: what they do, what to look for, and how to select the best parts for your driving style.

Front Suspension Parts

The 1974 Duster front suspension is a torsion bar independent setup. Key components include upper and lower control arms, torsion bars, ball joints, tie rod ends, and sway bars.

Upper and Lower Control Arms

Control arms connect the wheel hub to the frame. Over time, bushings wear out, causing sloppy steering and alignment issues. You can replace just the bushings or buy complete control arms with new bushings and ball joints already installed. For a stock restoration, OEM-style arms are fine. For better handling, tubular control arms reduce weight and improve geometry. Look for arms made of heavy-duty steel or chromoly.

Torsion Bars

Torsion bars act as springs in the front. They twist to absorb bumps. Original torsion bars have a certain spring rate. If your Duster sits low or rides harshly, the bars may be sagging. You can replace them with stock replacements or upgrade to larger diameter bars for a firmer ride. Common aftermarket options include 1.02- and 1.06-inch bars. Swapping torsion bars is a straightforward bolt-on job, but you’ll need to adjust the ride height afterward.

Ball Joints

Ball joints allow the steering knuckle to move. Worn ball joints cause clunking noises and tire wear. Replace them in pairs (both upper or both lower). For the 1974 Duster, the lower ball joint is larger than earlier models—make sure you get the right one. Moog and TRW are reliable brands.

Tie Rod Ends

Tie rod ends connect the steering rack to the wheels. Worn tie rods cause play in the steering. Replace inner and outer ends together. The ’74 Duster uses a standard A-body setup. Aftermarket tie rods often come with grease fittings for longer life.

Sway Bar

The front sway bar reduces body roll. Many Dusters came with a small-diameter bar. Upgrading to a larger bar (e.g., 1-1/8 inch) improves cornering without a harsh ride. Polyurethane bushings are inexpensive upgrades that make the bar more effective.

Rear Suspension Parts

The rear uses leaf springs, shock absorbers, and a sway bar on some models.

Leaf Springs

Rear leaf springs support the axle and absorb bumps. Over time, springs sag, lowering the rear. You can buy new standard leaf packs or upgraded ones with more leaves for heavier loads or better handling. For a stock replacement, look for springs with the correct arch height. Some aftermarket springs offer multiple leaf options to adjust ride height.

Shock Absorbers

Shocks dampen spring oscillation. The 1974 Duster uses different front and rear shocks. Standard replacement shocks (like Monroe or Gabriel) are fine for daily driving. For performance, consider adjustable shocks that let you tune ride stiffness. Bilstein and KYB are popular choices. Make sure to use a shock that fits the original mounting points.

Rear Sway Bar

Not all Dusters have a rear sway bar. Adding one reduces oversteer and improves stability. Aftermarket kits come with all necessary hardware. A 7/8-inch bar is a common upgrade.

Steering and Alignment Parts

Don’t neglect the steering gear and bushings. The ’74 Duster uses a recirculating ball steering box. If there’s slop in the wheel, the box may need adjustment or replacement. Pitman and idler arms also wear. Replace them with heavy-duty units if you notice play.

Alignment is crucial after suspension work. The 1974 Duster has adjustable camber and toe. Find a shop that knows Mopar specs.

Buying Guidance: New vs. Rebuilt vs. Used

New parts are best for reliability. Rebuilt parts (like control arms) can save money but check the work. Avoid used parts unless you’re sure they’re in good shape. Rubber bushings wear out, so old used parts may need immediate replacement.

Brands to Consider

• Moog: steering and suspension rubber parts, decent quality.
• TRW: OEM-quality ball joints and tie rods.
• Bilstein: high-performance shocks.
• Hotchkis: performance leaf springs and sway bars.
• PST (Performance Suspension Technology): complete rebuild kits.
• Energy Suspension: polyurethane bushings.

Stick to known brands to avoid premature failure.

Practical Installation Tips

• Soak bolts in penetrating oil a day before.
• Use a floor jack under the lower control arm when removing torsion bars—they’re under tension.
• Replace all bushings at once.
• Get an alignment after any front suspension work.
• Consider upgrading to polyurethane bushings for better response, but expect a slightly firmer ride.

Final Recommendation

For a 1974 Plymouth Duster that sees mostly street driving, a complete Moog front-end kit (including control arms, ball joints, tie rods) and new OEM-grade leaf springs with standard shocks will restore the factory ride. If you want improved handling, add a 1-1/8 front sway bar, gas-charged shocks, and polyurethane bushings. Avoid cheap generic parts—stick to established suspension brands. Measure your current ride height and consult the factory service manual for proper adjustments. With the right parts, your Duster will ride and handle like new.